You guys are right. It's a white sturgeon. Take a look at this link: http://www.lenssportfishing-bc.com/sturgeon-fishing.htm
You may also be interested to read the write up in the Grand Forks paper about the hoax.
http://www.grandforks.com/mld/grandforks/sports/columnists/brad_dokken/14528710.htm
Sully